custom taxonomy sort order not working

I have created a custom taxonomy named product_categories.

It has three fields :

1. for banner image

2. for category image and

3. for sort order.

I have added 10 categories in it giving its sort order input also.

Now i want to show this in sorting order but it is not working.

In pt-categories input for sort order is this

<tr class="form-field">
<th scope="row" valign="top"><label for="cat_sort_order"><?php _e('Product Sort Order'); ?></label></th>
<td>
    <input id="banner-url" name="term_meta[sort_order]" type="text" style="width: 100%;" value="<?php echo $term_meta['sort_order'] ? $term_meta['sort_order'] : ''; ?>" />
    <span class="description"><?php _e('&nbsp;'); ?></span>
</td>

Saving funtion is this

    function save_product_categories_custom_fields($term_id)
    {
    if (isset($_POST['term_meta'])) {
        $t_id = $term_id;
        $term_meta = get_option("taxonomy_term_$t_id");
        $cat_keys = array_keys($_POST['term_meta']);
        foreach ($cat_keys as $key) {
            if (isset($_POST['term_meta'][$key])) {
                $term_meta[$key] = $_POST['term_meta'][$key];
            }
        }
     //save the option array
        update_option("taxonomy_term_$t_id", $term_meta);
    }
}

Here is the categories called

function getLatestProducts() { 
$args = array(
  'post_status' => 'publish',
  'post_type' => 'products', 
  'posts_per_page' => 12,
  'meta_key'        => '_cus_sort_order',
  'orderby'         => 'meta_value_num', 
  'order' => 'ASC'
);
?>
<?php
                $args = array(
                'orderby' => 'name',
                );
                $terms = get_terms('product_categories', $args);
                foreach($terms as $term) {      
               $prod_meta = get_option("taxonomy_term_".$term->term_id);
                    ?>
                <a href="<?php echo get_term_link($term->slug, 'product_categories') ?>">
                <?php
                    echo '<img src="'.$prod_meta['img'].'" title="" alt=""></a>';    ?>
                </div>
                <div class="product-name">
                <h5>
                <a href="<?php echo get_term_link($term->slug, 'product_categories') ?>">
                <?php echo $term->name;?>
                </a>
                </h5>

It is showing the categories names and images but not in sorted order.